Magnetic screw



Nov. 24

1925 B. ANDREWS MAGNETIC SCREW @d m. w s m FVOWW ma 7 m @mm3 www 3 mm w .W 6 Mp 2 #ik/// i ,A 9 M?, MQ m .w l m..

Paanadw-.Nmf- 24, 1925.

UNITE-D STATES PATENT oFFiCE.

BENJAMIN ANDREWS, 0F HOUSTON, TEXAS.

MAGNETIC SCREW.

Application -iiie'a my 4, 1925. serial m. 28,035.

To all wko/m. it may concern.'

Be it known that I, BENJAMIN ANDREWS, residing in Houstonj county of Harris, State of Texas, have invented certain new land useful Improvements in Magnetic Screws, of which the following is -afull, clear, concise, and exact description. l

My invention relates to reciprocating devices which are controlled by a rotating member having helically arranged ribs'similar to screw threads, but which are magnetized to form i magnetic circuits with a similarly grooved stationary member whose threads are also magnetized to complete the 'magnetic circuit formed by the rotating member.

The main object of my invention is to produce a driving mechanism which, when operated to rotate the movable member, will cause a comparatively slow longitudinal movement of the, driving member, mbut when ,the magnetism is discontinued by v breaking the electric current, the discontinuance of the magnetization will allow the movable member lto reciprocate freely,

' longitudinally.' Such devices vare applicable to various machines or apparatus where it is desired to produce the reci rocating motion through vthe rotation of) the ,driving member, such as in the operation of pumps, hammers, drills, riveting appliances and so forth.

.` The magnetic screw is particularly adapted for the umping of oil and similar liquids from riving wells when the pump is located at a considerable distance below the surface of the earth, and where it is neces? sary to supply the owerfor operating the pump from the sur ace of the ground. Un-

I der such conditions the magnetic screw driving mechanism `may be lowered together with the pump vthrough the well casing and operated at a `point just above the liquid to be pumped from the well.

\ .Varlous other applications of my improved magnetic screw will be apparent to l those skilled in the art without specic reftwo forms which I at erence thereto. A detailed description of resent deem preferable is set forth int e following specilication and accompanying drawings forming a art. thereof, in which ig. 1 is a view in elevation of one form of m device showing the tubular casing there or in cross section;

Fig. 2 is an enlarged view of the central portion of the device shown in Fig. l; and

Fig. 3 is a cross-sectional view of a modilied form of a device to which the screws may be applied.

Referringto the drawings, the numeral 1 indicates a casing which is adapted to con tain the parts of the magnetic screw and a shaft or pipe communicating motion to the apparatus to be operated thereby. In the present instance, the numeral 2 indicates a pump provided with suitable inlet and outlet pipes 3 and 4f. This is connected to the central operatingrod or shaft 5 by means of a coupling 6 having a slip joint provided by a Harige 7 which allows the shaft 5 to rotate without turning the plunger of the pump. p

Referring now to Fig. 2, the numerals 8 and 9 indicate two sleeves of magnetic material, such as iron or steel, having formed therein two parallel helical grooves 10 and 11, and 12 and 13, respectively, the grooves inh the sleeve8 having a pitch vopposite fro'mwthe grooves in the sleeve 9. The windings in the groove 10 are connected with a lead 14e which passes downward through sai-d groove to the bottom, whence they are then conducted to the groove 11, as indicated inlFig. 2 "and pass upwardly through said groove until they emerge at the top as indicated by the conductor 15 in Fig. 2, said conductor'being there groundi have, respectively,` pairs of grooves 21 and 22, and 23 and 24, also containing windings for magnetizing said cores. The windings in the grooves 21 and 22.are supplied with current through the conductor 25 1n a similar manner to that previously described, the windings bein connected together at the lower end of t e cores so that the current passes downward thro h one groove, and upward through the other. The conductor'25 is then grounded on the cenlll) tral shaft 5, as indicated at 26. The conductor is carried upward to an insulated sleeve 27. A conductor 28 passes through the core 19 and down to and into the core 2O where it connects with the windings inv i grooves carry currents in opposite directions, the magnetic fields created thereby -will be formed into closed circuits, half of which are in the sleeves and the other half of which are in the cores, as indicated in Fig. 2 at 62. Thus the magnetic circuits are -made very short and will produce a strong attraction between the helical ribs formed on the sleeves and cores, respectively. When the central shaft is rotated causing the. cores to rotate, this magnetic attraction will have'the same effect as the engagement between interlocking threads of a screw and'wlll cause the cores to move up and down according to the pitch of the f ribs and the dircctionxof rotation of thc cores.

Referring now to the upper portion of Fig. l, thenumcral Slimlicates an electric motor or other guiding mechanism which in the case of a motor is supplied' with current from the mam leads 32 and 33.

The motor shaft 34 carries a worin 35 which meshes with a corresponding worm wheel (not shown) on the shaft 5 to which it-is slidably keyed. Thus the rotation of the shaft 34 will rotate the shaft 5 continuously in one direction which .will be assumed to be the direction indicated by the arrow near the top of Fig. 1. The shaft 5 also has slidably carried thereon a contact,l

ring 36, which is adapted to engage a brush or suitable contact 37. This contact is connected with one of the leads 32, as indicated by 38.

On a suitable support 39 is carried a reversing switch 40 which is adapted to be operated by collars 41 and 42 on t-lievshaft 5. The pivot of the switch 40 is connected with a lead 43 which is in turn connected .with the main lead 33. The switch 4 0 is also provided with two contacts/44 and- 45, the former of which is connected to lead 46 including a cut-out switch 47. The lead 46 is connected to the conductor 14 running to the winding of the u per sleeve 19 of the magnetic screw and a so is provided. with a branch conductor 48 runnlng to the brush 49 in contact with the insulated sleeve 27. The contact 45 of the switch 40 is connected with a conductor' 50 which runs to the brush 51 enga ing theY insulated sleeve 30, from Whic the conductor 28 runs'to the windand that a contact has just been made at the point 45, the current will be conducted through the leads 33, 43 and 50 to the brush 5l, sleeve 30, conductor 28, where it will pass through the windings of the core 20, emerge through the conductor 29, pass to the` shaft 5, contact ring 36, brush 37, lead 38 and main supjply lead 32. Thus said core 20 is energized. .The branch 52 or the lead 50 conducts the current to the lead 16 which connects with the windings in the grooves 12 and 13 of the sleeve 9. From the windings of the sleeve it passes to the casing 1 at 18, through said casing tothe conductor 53 by whichit is connected to the main lead 32. Thus the grooved sleeve 9 'and core 20 are energized. It being noted that the shaft is rotating in the direction of the arrow in Fig. 1, the core 20 will be correspondingly rotated which is in the same direction as when withdrawing a screw, as concerns the effect of the winding on the sleeve 9 and core 20, and, therefore, the core 11 and shaft 5 will be raised or drawn upward operating the pump 2 on an upward stroke. When the collar 42 comes in contact with the switch 40, said switch will engage the contact 44 thereby Vbreaking the circuit in the sleeve 9 and core 20, but cornpleting the circuit in the sleeve 8 and core 19,y in which the grooves and windings are of opposite pitch from those in the sleeve 9 and core 20. Since the rotation of the shaft continues the same, as indicated by the arrow, themagnetic connection 'between the sleeve 8 and the core 19 will cause said core and'- shaftv v5 to descend, thus causing the pump 2te act on'a downward stroke. At the end of the stroke the collar 41 again comes inv contact with the switch arm 40 and the motion is reversed repeating the action first described. In the conductor 46g' theswitch 475may be used vto disconnectA both the windings inthe sleeve 8 and-the core 9 from the source of supply of the electric current. When said switch is open, of course, the windings in said sleeve 8 and core 19 will become inactive, thus the rotation of the shaft 5 will cause the same to be raised when theV windings in the sleeve 9 and core 20` are inactive, asv indicated by the connection in Fig. 1 When the collar 42 strikes the switch arm 40 the current will be also disconnected from the windings in the sleeve 9 land the core 20, which will sol allow it to drop by gravity, thus producdescribed. This manner of operating the device maybe used where a quick heavy paratus therein shown is similar to that of Fig. 1, except that the main shaft is made hollow and therefore' constitutes a pipe 54 which passes through a casing at the bottom of the well or projecting into a body of liquidto be pumped. The casing 55 is provided with a stuing boX 56 and at its extreme Llower end with a check valve 57`of any suitable form, but in the present instance is shown as including a ball 58 which is retained in position by a web or'retainer 59.` The "lower end of the pipe 54v is pr'ovided also with a check valve 60 and a retaier 61. The end of the pipe 54 makes a sliding Contact' with the lower end of the casing 55 and constitutes a plunger therein. It will thus be seen that when the pipe 54 the core 19 connected as shown in Fig; 2, the lo'werend of the i 54 will act as a plunger of a pum amfdii'w liquid into the casing 55 throng which it passes to the valve 60 into the pipe 54, and thus upward to the surface of the ground or other point where the liquid is to be delivered.

It will thus be seen that I have producedV a very eicient and simple apparatus for reciprocating two relatively to each other, and theI principles involved .in this device may be applied to a large number of uses, such as those above outlined.`

What 'I claim and desire to protect by Letters Patent is: 1. In a device for producing a reciproeatingl motion, an inner ,cylindrical member having a pair of helical grooves therein. an

v outer cylindrical member enclosing. said inn'er member `and having internal, helical grooves corresponding t those on the inner member, conductors located in one of said grooves to produce magnetization of, op-

' posite polarltyon successive ribs between is reciprocated by. the corei20 and also by said grooves, and means for rotating one of said members relative to the other.

2. In a device for producing a reciprocating motion, an inner cylindrical member havinga pair of helical grooves thereon, an outer cylindrical member enclosing said inner member and having internal helical grooves corresponding to those on said inner member, conductors located inthe grooves in o'ne of said members and connected to cause currents to fiow in opposite direction in successive grooves. and means for rotating one of said members relative to the other.

3. A device for producing a reciprocating motion comprising an mner member having a pair of parallel helical grooves thereon,

electric conductors contained in said grooves connected to carry the current in opposite directions in each of saidgrooves, an outer member having a similar pair of grooves, conductors contained therein and` so connected as to carry the electric current in opposite directions therein whereby closed fields of force are successively produced in opposite directions between said grooves, andv means for rotating one of said members relative to the other.

I 4. A device for producin a reciprocating motion comprising a lura 'ty of inner rotatable members each raving a pair of helical groovestherein, the grooves' in adjacent members having opposite pitch, a rigid con# nection between said members, electric conductors; in said grooves connected to carry current in opposite directions in 'adjacent grooves, a plurality of outer xedmembers enclosing said inner members and provided with grooves and conductors corresponding to those in said inner members, means for rotating said inner vmembers, suitable contacts for conducting electric current to said windings and switch ing' mechanism for y controlling the current in said windings through motion 'of saidinner members.

Signed at Houston, Texas, this 28th day of April 1925.

- 'BENJAMINANDBEWS Y 

